DC Amplifier 1 (CB21902E)

This circuit for analog instruments was found in a Raytheon documentation from the 1960s. Transistors are germanium types from the time.

Symmetrical 15 V Power Supply (CB19622E)
This source is used to supply circuits with operational amplifiers, being originally created for...
Square Wave Generator (CB19372E)
The transistors in this 80's documentation project may be BC548, the most modern equivalents of...
Constant Current Source for LEDs (CB915E)
This circuit uses a FET to drive an LED with constante currente. The current up to 20 mA can be...